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I'm guessing this drawing from page 10 of this thread is an Aperiodic design? I have 45 and 2A3 SET amplification, so the increased sensitivity is very interesting. James

Ingvar, Have you heard the RLK horn with both the 12E120 and 12P80ND? If so, which do you prefer?  I would suspect the 12P80ND would have better low end extension, which is important to me. Does the horn loading increase the sensitivity or efficiency of the bass driver?  I would like to use a...